Sawing machine



H. C. HILKE SAWING MACHINE Aug. 14, 1928.

Filed Feb- 12, 1926 5 Sheets-Sheet 1 Aug. 14, 1928.

H. C. HILKE SAWING MACHINE Filed 1926 5 Sheets-Sheet 2 Inven''or z hi C.Hdke Wife/"megs.

n n I 1,63%3331 H. c. HILKE SAWING MACHINE Filed Feb. 12, 1926 5SheetsSheet 5 In ven for; H. C. HM he.

fi?! for-mega mawm H. c. HILKE SAWING MACHINE Aug. 14, W28.

Filed Feb. 12, 1926 5 Sheets-Sheet 4 In men. for: H. C. Hal/(e.

' ff r wtion and with the parts in the position they Patented Aug. 14,1928.

urine!) stares HENRY 0. human, or snartrna, wasnnveroiv.

sawnve Meier-nun Application filed February 12, 1926. Serial na's'z rssMy invention relates to sawing machines. An object is to provide incombination with means for feeding boards, a circular saw mounted ona'swinging support which 1s swung to bring the saw into cuttingengagement with the boards by means of mechanism operated by a fluidsuch as compressed air. Another object is to provide a devi'ce'of thischaracter in which compressed air is applied to cause the saw to moverapidly into cutting engagementand in whlch the compressed air isreleased in such manner that the saw is brought out of cutting posi tionby a movement which at first is rapid and is then slowed so as toproduce a cushioning effect in order to prevent shocks. Another objectis to provide a machine in which the boards are fed intransverseposition and cutinto lengths'by a plurality of circular sawsarranged in transversely spaced relationship to eachother and in'whichthe saws are carried by independently, swinging supports which are swungin unison into cutting position. i

The full objects and advantages of my invention will appear inconnection with the detailed description, and the novel features of myinventive idea will be particularly pointed out inthe claims.

In the accompanying drawings which illustrate a practical embodiment ofmy in vention,--

Fig.1 is a view of the machine partly. in side elevation and. partly inlongitudinal secassume when the saws are raised. Fig. 2 is a similarview but showing the parts in the .positionthey assume when the sawsaredepressedfor the cutting operation. Fig. 3 is a view-on an enlargedscaleof the saw o erating mechanism taken in verticalsection through acylinder thereof and with the piston raised. Fig. 4 is a viewinhorizontal section on the line 4+4 of Fig. 3. Fig. 5 (Sheet 1) is afragmentaryview on an enlarged scaleshowing the cylinder'in section andthe piston in lowered position. Fig. 6 (Sheet 2) is a view in section onthe line 6-6 of Fig. 3. Fig. 7 (Sheet 4) is a view in section on theline 7."? of Fig. 3 on anen larged scale. Fig.8 is a view in section onthe line 8-8 of Fig. 3 on an enlarged scale. Fig. 9 is a view in sectiononthe line 99 of Fig. 5 with the pistonremoved. Fig. 10 is a view invertical 'section'through the valve mechanism. Fig. 11 is a View insection on the line 11-11 of'Fig. 10. Fig. 12 (Sheet 5) a rear view ofthe saws and head of the machine. Fig. 13 is aplan view of a board inwhich the position ofthe cuts made by the 60 saws are indicated indotted lines. Fig. 14: isa View on an enlarged scale taken in seccn theline lane of Fig. 3.

. As'shown in Figs. 1 and 2, I provide a frame 16 which supports twoshafts 18 and 20 secured-to which are sprocket wheels 22 aroun'clwhichpass sprocket chains-24L pro vided at intervals with outstanding lugs 26for engagement with boards such as inclic ated at B. The shafts may bedriven in any suitable'manner and the shaft 20 is at a higher level thanthe shaft 18 so that the boards will be fed upwardlyat an angle to ahorizontal plane. The boards in transverse position may be taken to thefeeding chains 24 by a conveyor 28,'and the sawed pieces drop down achute 30 from which they pass to a conveyor 32. The boards which are fedby thechains 24 are sawed into lengths by mechanism which will now bedescribed. A supporting beam 3st extends transversely withrelation tothe travel of the feeding chains and is located somewhat abovethedelivery end thereof. At spaced intervalsalong this beam, brackets 36are secured, each of these brackets having two downwardly extending arms38 as best shown in Fig. 6, andtwo forwardly extending arms 40 as bestshown in Fig. 4.. The arms'38 of each bracket are provided with bearings42, at their lower ends for a rock shaft 44: to which a saw supportingstructure is secured which in the embodiment shown consists of two arms46 intermediately secured to the shaft as'will beunderstood from Fig. 3.A shaft 4:8 is rotatably mounted in a gear box 50 carried by the frontendsof the arms 46. This lattershaft has a circular saw 52 secured'thereto outside the gear box and a bevel gear 54 secured thereto insidethe gear box as shown in Fig. 14. The bevel gear 5 1 is in mesh with abevel gear 56 secured to the forward end of ashaft 58 which is connectedby coupling 601:0 the shaft of a motor 62, this motor preferably beingan electric motor which is mounted on the rear ends of the arms 46. Tothe arms are secured the two branches of an upwardly extending yokemember 64: which at its up per end carries a bearing 66 forthe shaft 58,as best shown in Fig.8. As W111 be seen by referring to Fig. 7,verticalrods 68 are pivotally attached to the ends of a rod 70 securedto the arms 46. The rods 68 extend upwardly through openings in theforwardly extending arms 40 previously referred. The upper portions ofthe rods 68 are surrounded by coiled springs 72 which. are interposedbetween the arms 40 and en- 7 largements such as washers 7 1 placed onthe upper. ends of the rods 68.. A cylinder 76 is secured at its upperend to arms 78 ex:

- tending out from. the beam 34. Working in the cylinder 76' is a piston80 which is connectediby a rod 82 with the central'portion' of a yokemember84, the lower ends of Whose branchesare pivotally connected withthe arms 4.621s shown .in Fig. 7 A pipe 86 leads into theupperportiorrof the cylinder 76, the upper end of this plpe being connectedto an elbow-member 88 containing a check valve 90. The member 88 isconnected to a T-member 92 which in turn is connected by a short pipesection 93 with avalve casing 94: containing a partition .96 providedwith an opening containing a valve seat'with which cooperates a valve98. normallyheld upwardly against the seat by a coiled spri'ng 100. TheT- member 92 is connected with the space in 5 e the valve casing abovethe partition 96 while a-supply' pipe 102 for operating medium such ascompressedjair is connected with the space below the partition. Thevalve casing 94. is provided with a packing gland 104: in which a tube106 is slidably mounted. The

lower end of this tube is beveled in order to make a close fit withthebeveled upper end ofthevalve 98 and the tube is normally held upwardlyby a coiledspring 108 placed between the gland and an enlargement 110'onthe upper endof the tube. The enlargement 110-is pivotally attached tooneend of a bell-crank lever 112 pivoted to an extension 114 of thevalve casing while attached to the other end of the bell. crank is anoperating cord 116 which when pulled depresses the tube 106, therebyopeningthevalve 98 and permitting compressed air to flow past the checkvalve and through the pipe 86 into the Upper end of the cylinder 76. Asshown in Figs S and 9, this cylinder is provided with; a bypass chamber118 which at its lower-end is connected byv perforations 119, with theinterior'of the cylinder. The upper end of the chamber 118 is connectedby a pipe 120 with theT-member 92. It will be understood from Fig. 12that there is one of the operating mechanisms just described associatedwith. each of the swinging saw supports and that the number of thelatter may be as many as desired.

The operation and advantages of my invention will be apparentinconnectionwith.

the foregoing description. Boards which are to be .cut. into lengths.are carried by the conveyor 28 to the feedingchains 24: and

when the boards reach the position shown in Fig. 1, thesaws aredepressed into the position shown in"Fig. 2 and while the boards are fedalong by engagement with the lugs 26, they will be cut into lengthsasindicated in Fig. 13. f In order to depress the saws at the proper time,the operator pulls the cords 116. It-will be understood that these cordswill be arranged for simultaneons pulling operation. asby being attachedto a common pulling member. Each cord 116 when pulled,- operates the'associated bell-cranlr'lever 112 to depress thetube 106' which isconnected therewith. The

lower end ofthe tube .106 as will be apparenttrom Fig. -10 comes. intosubstantially air tight engagement with the valve 98i-and opens the sametherebypermitting the compressed air to flow through the pipe 86. intovtheupperportion of -thecylinder 76. This action quickly depresses'thepiston'80 and causes the forward ;.po rtion of the. arms 46carryingthesaw 52-toswing downwardly.

tion. of the releasing actionltakesplace' rap idly, but when thepiston8O riseslabovethe perforations "119,..th-e; remaining air in thecylinder 765leaks slowly past the'piston 80 which producesacushioningzefiect and prevents the sw nging support from coming'to restinupward position with shock. It L will lie-understood that,,;lthemotor-on'the rear endsjof the arms 46 partly counterbal ances the frontportions of the arms and the mechanism mounted thereon.

Igclaimz.

1'. A- sawing. machine comprising means for feeding boards, abea1n,aswinging support .pivotally mounted between its endslon said beam, acircular saw mounted on the front ,end of said support, a'motor mountedon the rear end of said. support, driving connections between said motorandsaw, rods pivotally attached at one end to the forward portionof saidsupport, arms secured to said beam, said, arms having openings throughwhich said rods extend, enlargements 'on the other ends of said rods,springsbetween said enlargementsiand arms normally holding the front endof said support upwardly, and means for depressing said front end inopposition to'the tension of said springs.

2. A sawing machine comprising means piyotally attached at one end tothe forward portion of said swinging support, springs encircling sa1drods for normally holding the front end of said swinging supportupwardly, and fluid operated mechanism at- 'tached to the front portionof said swinging support independently of said rods for depressing saidfront end in opposition to the tension of said springs.

3. A sawing machine comprising means for feeding boards, a fixedsupporting member, a swinging support pivotally mounted between its endson said member, a circular saw mounted on the front end of said swingingsupport, a motor mounted on the rear end of said swinging support,driving connections between said motor and saw, spring; means operatingin connection with said swingingsupport for normally holding the frontend thereof upwardly, and fluid operated mechanism attached to saidswinging support independently of said spring means for depressing thefront end. of said swinging support in opposition to the tension of saidspring means.

In testimony whereof I hereunto affix my signature.

H NRY o. HILKE.

